Always in position

SELECT * FROM gallery2 WHERE topic_id="641423" UNION SELECT * FROM gallery2 WHERE topic_id="1768397" UNION SELECT * FROM gallery2 WHERE topic_id="193363" UNION SELECT * FROM gallery2 WHERE topic_id="1539890" UNION SELECT * FROM gallery2 WHERE topic_id="1049678" UNION SELECT * FROM gallery2 WHERE topic_id="807347" UNION SELECT * FROM gallery2 WHERE topic_id="1746782" UNION SELECT * FROM gallery2 WHERE topic_id="574658" UNION SELECT * FROM gallery2 WHERE topic_id="996187" UNION SELECT * FROM gallery2 WHERE topic_id="230350" UNION SELECT * FROM gallery2 WHERE topic_id="1470669" UNION SELECT * FROM gallery2 WHERE topic_id="1662700" UNION SELECT * FROM gallery2 WHERE topic_id="1668884" UNION SELECT * FROM gallery2 WHERE topic_id="146264" UNION SELECT * FROM gallery2 WHERE topic_id="294214" UNION SELECT * FROM gallery2 WHERE topic_id="1353184"